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Method for preparing dielectric crystal of calcium tungstate rapidly

A calcium tungstate mesocrystalline and fast technology, applied in chemical instruments and methods, single crystal growth, crystal growth, etc., can solve problems such as unfavorable large-scale production, complex reaction devices and preparation processes, and avoid the rapid growth of crystal nuclei Large, achieve directional self-assembly, good repeatability

Inactive Publication Date: 2007-05-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method usually requires the target product to respond to electric or magnetic fields, so it has certain application limitations, and the reaction device and preparation process are complicated, which is not conducive to large-scale production

Method used

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  • Method for preparing dielectric crystal of calcium tungstate rapidly
  • Method for preparing dielectric crystal of calcium tungstate rapidly
  • Method for preparing dielectric crystal of calcium tungstate rapidly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Add 14.02mL of n-octane, 1.15mL of n-butanol, 1.3g of cetyltrimethylammonium bromide (CTAB) in a 50mL Erlenmeyer flask, and add 1.90mL of 0.5mol l -1 Aqueous calcium chloride solution. Stir for 30 minutes to form a homogeneous and transparent calcium ion microemulsion.

[0021] 2) Add 14.02mL of n-octane, 1.15mL of n-butanol and 1.3g of cetyltrimethylammonium bromide (CTAB) in a 50mL Erlenmeyer flask, and add 1.90mL of 0.5mol·l -1 Sodium tungstate aqueous solution. Stir for 30 minutes to form a homogeneous and transparent tungstate ion microemulsion.

[0022] 3) The above two microemulsions respectively containing calcium chloride and sodium tungstate were rapidly mixed at 25° C., continued to stir for 10 minutes, and the reaction was completed. Centrifuge, wash with deionized water and absolute ethanol several times, and vacuum dry at 60°C for 6 hours to obtain calcium tungstate mesocrystals.

[0023] Fig. 1 is the X-ray diffraction diagram of the obtained calci...

Embodiment 2

[0025] 1) Add 13.66mL of n-octane, 1.05mL of n-butanol and 1.15g of cetyltrimethylammonium bromide (CTAB) in a 50mL Erlenmeyer flask, and add 1.48mL of 0.15mol·l -1 Calcium nitrate aqueous solution. Stir for 30 minutes to form a homogeneous and transparent calcium ion microemulsion.

[0026] 2) Add 13.66mL of n-octane, 1.05mL of n-butanol, 1.15g of cetyltrimethylammonium bromide (CTAB) in a 50mL Erlenmeyer flask, and add 1.48mL of 0.15mol·l -1 Sodium tungstate aqueous solution. Stir for 30 minutes to form a homogeneous and transparent tungstate ion microemulsion.

[0027] 3) The above two microemulsions respectively containing calcium nitrate and sodium tungstate were rapidly mixed at 25° C., and the stirring was continued for 10 minutes, and the reaction was completed. Centrifuge, wash with deionized water and absolute ethanol several times, and vacuum dry at 60°C for 6 hours to obtain calcium tungstate mesocrystals.

[0028] Fig. 3 is a scanning electron micrograph and a...

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Abstract

This invention relates to a method for rapidly preparing calcium tungstate mesorystals. The method adopts microemulsions as the media, and can obtain the product with a very short reaction time. The method comprises: adding n-octane, n-butanol and cetyl trimethyl ammonium bromide into the same amount and concentration of calcium salt aqueous solution and sodium tungstate aqueous solution, respectively, to obtain two transparent microemulsions, rapidly mixing the two microemulsions within a certain temperature range, stirring for 10 min, and terminating the reaction to obtain calcium tungstate mesocrystals. The method has such advantages as simple process, low cost and rapid reaction. The size distribution of the obtained calcium tungstate mesocrystals is uniform.

Description

technical field [0001] The invention relates to a method for rapidly preparing calcium tungstate mesocrystals. Microemulsion is used as a medium to prepare three-dimensional calcium tungstate mesocrystals within a very short reaction time. It belongs to the technical field of functional material preparation. Background technique [0002] Since the 1980s, nanomaterials have truly become a frontier hotspot in materials science and condensed matter physics. After 30 years of development, the research on nanomaterials has developed from the initial stage of synthesis of nanopowders with a certain degree of randomness, mining the physical, chemical and mechanical properties of nanomaterials, and designing composite materials to the present. A new stage of purposeful, emphasizing the design, tailoring, assembly and creation of nano-assembly systems according to people's wishes. The nano-assembly system and artificially assembled nano-structured material system have attracted mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/32
Inventor 巩强钱雪峰
Owner SHANGHAI JIAO TONG UNIV
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